BUFFALO SOCIETY OF NATURAL SCIENCES 19 



already so prevalent in much of the eurypterid material at Otisville, 

 has at the Delaware Water Gap reached such a destructive degree 

 that the shale is filled with a mass of comminuted eurypterid frag- 

 ments" (39, 417). 



Upper Siluric or Monro an. The Bertie waterlime of New York 

 of Upper Monroan age has long been famous for the wonderful euryp- 

 terid fauna which it contains. This has been found in two localities: 

 (1) in the quarriesin North Buffalo, Erie County, and (2) in Herkimer 

 County; there are scattered occurrences of single species in other 

 localities, which will be referred to below. The quarries at Buffalo 

 have yielded the largest number of remains, the specimens having 

 been sent in great numbers to museums all over the world, and the 

 rock has now been so well worked over that probably no new dis- 

 closures will be made. For purposes of study of the entire fauna of 

 the Bertie the large collection in the Museum of the Buffalo Society 

 of Natural Sciences offers excellent opportunities. The Bertie con- 

 tains the largest eurypterid fauna of any one formation in the world, 

 there being recorded fourteen species (39, 89) referred to four genera: 

 Eurypterus (5 sp.), Pterygotus (5 sp.), Eusarcus (1 sp.), and Doli- 

 chopterus (3 sp.). The specimens are for the most part astonishingly 

 well preserved, but other organisms are extremely rare. In the 

 Museum above referred to are a few specimens of marine organisms 

 obtained from the formation which furnished the eurypterids. One 

 slab of the waterlime about if inches thick shows on one side an 

 Orthoceras undulatum which is very much worn, the siphuncle being 

 exposed and the surface macerated (No. 13310 E 1639 of Buf. Soc. 

 Nat. Sci. Coll.) and on the other side is a well preserved Eurypterus 

 head (11461 E 976). There is one other specimen of 0. undulatum 

 (13309, E 1638) of a very carbonaceous nature. There are a number 

 of specimens of Trochoceras gebhardi, but as a rule these are found in 

 a rock not of the character typical of the Bertie layers bearing the 

 eurypterids. In one case it is arenaceous and not' a calcilutyte 

 (13353 E 1682), containing two fragmentary specimens. The slabs 

 containing the Trochoceras do not have eurypterid remains on them, 

 with one exception (13345 E 1674) in which there is a eurypterid claw 

 on a slab showing an imperfect T. gebhardi. Associated with the 

 eurypterids are a number of well preserved gastropod shells belong- 

 ing to a genus which is also known from the Monroe formation of 

 Michigan. This genus is Hercynella and it is represented at Buffalo 

 by two species H. patelliformis O'Connell and H. buffaloensis 

 O'Connell (200J. 



